No, the confusion for the Calvinists comes in trying to understand how they were saved.
Thus, in order to get assurance that they will remain saved they run to the Decrees.
Arminians have the opposite problem, they get saved correctly (at least the classical Arminians did) but then get concerned at keeping their salvation and begin doubting if they were ever really saved.
God in His mercy has made the New Testament Gospel very simple.
In the end, there can only be one Gospel.